/* ==========================================================================
   DocuMorph Design System & Stylesheet
   Modern Clean White Glassmorphism, Micro-animations, Curated Themes
   ========================================================================== */

:root {
  /* Color Tokens - Modern White Theme Default */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;
  --border-color: rgba(15, 23, 42, 0.08);
  --border-glow: rgba(99, 102, 241, 0.35);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;

  --accent-indigo: #4f46e5;
  --accent-cyan: #0284c7;
  --accent-violet: #7c3aed;
  --accent-emerald: #10b981;
  --accent-rose: #e11d48;

  --gradient-primary: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #0284c7 100%);
  --gradient-accent: linear-gradient(135deg, #0284c7 0%, #4f46e5 100%);
  --gradient-alt: linear-gradient(135deg, #e11d48 0%, #ea580c 100%);
  --gradient-glow: radial-gradient(circle, rgba(99, 102, 241, 0.08) 0%, rgba(255, 255, 255, 0) 70%);

  --shadow-sm: 0 2px 10px rgba(15, 23, 42, 0.05);
  --shadow-lg: 0 20px 45px -12px rgba(15, 23, 42, 0.08), 0 0 0 1px rgba(15, 23, 42, 0.06);
  --shadow-glow: 0 0 35px rgba(99, 102, 241, 0.18);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 9999px;

  --transition-fast: 0.18s ease;
  --transition-normal: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Optional Dark Theme when toggled */
body.theme-dark {
  --bg-primary: #0a0f1d;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.85);
  --bg-card-hover: rgba(30, 41, 59, 0.9);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(99, 102, 241, 0.4);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 20px 40px -15px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.08);
  --shadow-glow: 0 0 30px rgba(99, 102, 241, 0.25);
}

/* Reset & Base Setup */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Ambient Backdrops - Soft and Airy */
.ambient-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(140px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.18;
}
.glow-1 {
  width: 550px;
  height: 550px;
  background: var(--accent-indigo);
  top: -120px;
  left: -120px;
}
.glow-2 {
  width: 500px;
  height: 500px;
  background: var(--accent-cyan);
  bottom: 40px;
  right: -80px;
}

/* Header & Navigation */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}
body.theme-dark .app-header {
  background: rgba(10, 15, 29, 0.85);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
}

.logo-icon {
  width: 42px;
  height: 42px;
  background: var(--gradient-primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 4px 16px rgba(79, 70, 229, 0.35);
  transition: transform var(--transition-fast);
}
.brand-logo:hover .logo-icon {
  transform: scale(1.05) rotate(-2deg);
}

.brand-title {
  font-family: 'Outfit', sans-serif;
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.brand-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  background: rgba(79, 70, 229, 0.08);
  color: var(--accent-indigo);
  border: 1px solid rgba(79, 70, 229, 0.2);
  margin-left: 6px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 18px;
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #ffffff;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
  transition: all var(--transition-fast);
}
.btn-ghost:hover {
  color: var(--text-primary);
  border-color: var(--accent-indigo);
  background: rgba(79, 70, 229, 0.05);
  transform: translateY(-1px);
}
body.theme-dark .btn-ghost {
  background: rgba(255, 255, 255, 0.05);
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}
.nav-link:hover {
  color: var(--accent-indigo);
}

.theme-toggle {
  background: #ffffff;
  border: 1px solid var(--border-color);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
  transition: all var(--transition-fast);
}
.theme-toggle:hover {
  background: rgba(79, 70, 229, 0.08);
  border-color: var(--accent-indigo);
  transform: rotate(15deg);
}
body.theme-dark .theme-toggle {
  background: rgba(255, 255, 255, 0.05);
}
.sun-icon { display: block; font-size: 1.15rem; }
.moon-icon { display: none; font-size: 1.15rem; }
body.theme-dark .sun-icon { display: none; }
body.theme-dark .moon-icon { display: block; }

/* Main Wrapper */
.main-wrapper {
  max-width: 1080px;
  margin: 0 auto;
  padding: 48px 24px 80px;
  position: relative;
  z-index: 1;
}

/* Hero Section */
.hero-section {
  text-align: center;
  margin-bottom: 64px;
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 18px;
  background: rgba(79, 70, 229, 0.07);
  border: 1px solid rgba(79, 70, 229, 0.2);
  border-radius: var(--radius-full);
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--accent-indigo);
  margin-bottom: 24px;
  box-shadow: 0 1px 3px rgba(79, 70, 229, 0.08);
}
.pill-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-emerald);
  box-shadow: 0 0 8px var(--accent-emerald);
}

.hero-title {
  font-family: 'Outfit', sans-serif;
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -1.2px;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 36px;
}

/* Gradients */
.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.gradient-text-accent {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.gradient-text-alt {
  background: var(--gradient-alt);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Mode Switcher Tabs */
.mode-selector-container {
  display: flex;
  justify-content: center;
  margin-bottom: 30px;
}

.mode-tabs {
  display: flex;
  background: #f1f5f9;
  padding: 6px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  gap: 6px;
}
body.theme-dark .mode-tabs {
  background: rgba(17, 24, 39, 0.85);
}

.mode-tab {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 24px;
  border-radius: var(--radius-full);
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-family: 'Outfit', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.mode-tab:hover {
  color: var(--text-primary);
}
.mode-tab.active {
  background: var(--gradient-primary);
  color: #ffffff;
  box-shadow: 0 4px 16px rgba(79, 70, 229, 0.35);
}

/* Converter Card & Drop Zone */
.converter-card {
  max-width: 760px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 16px;
  box-shadow: var(--shadow-lg);
  position: relative;
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}
.converter-card:hover {
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
}

.drop-zone {
  border: 2px dashed rgba(79, 70, 229, 0.35);
  border-radius: var(--radius-md);
  padding: 44px 24px;
  text-align: center;
  background: #f8fafc;
  transition: all var(--transition-normal);
  cursor: pointer;
  position: relative;
}
body.theme-dark .drop-zone {
  background: rgba(15, 23, 42, 0.4);
}

.drop-zone.dragover {
  border-color: var(--accent-cyan);
  background: rgba(2, 132, 199, 0.06);
  transform: scale(1.008);
}

.file-input-hidden {
  display: none;
}

.upload-icon-pulse {
  width: 82px;
  height: 82px;
  margin: 0 auto 18px;
  background: rgba(79, 70, 229, 0.08);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-indigo);
  transition: transform var(--transition-fast), background var(--transition-fast);
}
.drop-zone:hover .upload-icon-pulse {
  transform: translateY(-4px);
  background: rgba(79, 70, 229, 0.16);
}

.drop-title {
  font-family: 'Outfit', sans-serif;
  font-size: 1.45rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.drop-subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 22px;
}

.drop-cta-group {
  margin-bottom: 14px;
}

.sample-files-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 22px;
  flex-wrap: wrap;
}

.sample-label {
  font-size: 0.84rem;
  color: var(--text-muted);
}

.btn-sample {
  background: rgba(79, 70, 229, 0.07);
  color: var(--accent-indigo);
  border: 1px solid rgba(79, 70, 229, 0.22);
  border-radius: var(--radius-full);
  padding: 6px 14px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast);
}

.btn-sample:hover {
  background: var(--accent-indigo);
  color: #fff;
  border-color: var(--accent-indigo);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: var(--gradient-primary);
  color: #ffffff;
  border: none;
  padding: 13px 32px;
  border-radius: var(--radius-full);
  font-family: 'Outfit', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 4px 18px rgba(79, 70, 229, 0.35);
  transition: all var(--transition-fast);
  text-decoration: none;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(79, 70, 229, 0.5);
}
.btn-primary:active {
  transform: translateY(0);
}

.btn-large {
  width: 100%;
  padding: 16px;
  font-size: 1.05rem;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #ffffff;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 12px 24px;
  border-radius: var(--radius-full);
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
  transition: all var(--transition-fast);
}
.btn-secondary:hover {
  background: #f8fafc;
  border-color: var(--accent-indigo);
}
body.theme-dark .btn-secondary {
  background: rgba(255, 255, 255, 0.08);
}

.drop-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.8rem;
  color: var(--text-muted);
}
.meta-separator {
  opacity: 0.4;
}

/* Process View & File Card */
.process-view {
  text-align: left;
}

.file-meta-box {
  display: flex;
  align-items: center;
  gap: 16px;
  background: #f8fafc;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  margin-bottom: 24px;
}
body.theme-dark .file-meta-box {
  background: rgba(30, 41, 59, 0.6);
}

.file-type-icon {
  font-size: 2.1rem;
  line-height: 1;
}

.file-info-details {
  flex: 1;
  min-width: 0;
}

.selected-file-name {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 4px;
}

.file-info-sub {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.84rem;
  color: var(--text-secondary);
}

.badge-direction {
  background: rgba(79, 70, 229, 0.1);
  color: var(--accent-indigo);
  padding: 2px 10px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.75rem;
  border: 1px solid rgba(79, 70, 229, 0.2);
}

.btn-cancel {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.25rem;
  cursor: pointer;
  padding: 6px;
  border-radius: 50%;
  transition: all var(--transition-fast);
}
.btn-cancel:hover {
  color: var(--accent-rose);
  background: rgba(225, 29, 72, 0.1);
}

/* Progress Bar */
.progress-container {
  margin-bottom: 24px;
}

.progress-bar-wrapper {
  height: 10px;
  background: #e2e8f0;
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: 10px;
}
body.theme-dark .progress-bar-wrapper {
  background: rgba(255, 255, 255, 0.08);
}

.progress-bar-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 0 12px rgba(79, 70, 229, 0.5);
}

.progress-status-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.progress-percentage {
  font-weight: 700;
  color: var(--text-primary);
}

/* Result Box */
.result-box {
  background: rgba(16, 185, 129, 0.06);
  border: 1px solid rgba(16, 185, 129, 0.28);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  animation: fadeIn 0.4s ease-out;
}

.success-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent-emerald);
  font-family: 'Outfit', sans-serif;
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 18px;
}

.result-details {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  background: #ffffff;
  padding: 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  margin-bottom: 20px;
}
body.theme-dark .result-details {
  background: rgba(0, 0, 0, 0.25);
}

.result-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.stat-label {
  font-size: 0.74rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.stat-value {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.engine-badge {
  color: var(--accent-indigo);
}

.result-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Error Banner */
.error-banner {
  background: rgba(225, 29, 72, 0.08);
  border: 1px solid rgba(225, 29, 72, 0.28);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 18px;
}
.error-message {
  flex: 1;
  font-size: 0.88rem;
  color: #be123c;
}
body.theme-dark .error-message {
  color: #fecdd3;
}
.btn-retry {
  background: var(--accent-rose);
  color: white;
  border: none;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
}

/* Features Section */
.features-section {
  margin-top: 80px;
}
.section-header {
  text-align: center;
  margin-bottom: 48px;
}
.section-title {
  font-family: 'Outfit', sans-serif;
  font-size: 2.1rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}
.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  box-shadow: 0 4px 14px rgba(15, 23, 42, 0.04);
  transition: all var(--transition-normal);
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-sm);
}
.feature-icon-wrapper {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}
.icon-emerald { background: rgba(16, 185, 129, 0.12); color: var(--accent-emerald); }
.icon-blue { background: rgba(2, 132, 199, 0.12); color: var(--accent-cyan); }
.icon-purple { background: rgba(124, 58, 237, 0.12); color: var(--accent-violet); }

.feature-card h3 {
  font-family: 'Outfit', sans-serif;
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text-primary);
}
.feature-card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.6;
}

/* Modal Popup */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 680px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  padding: 28px;
  box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.25);
  position: relative;
}
body.theme-dark .modal-card {
  background: var(--bg-secondary);
}
.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 18px;
}
.modal-badge {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-indigo);
  text-transform: uppercase;
}
.modal-title {
  font-family: 'Outfit', sans-serif;
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-primary);
}
.modal-close {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 1.3rem;
  cursor: pointer;
  padding: 4px;
}
.modal-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.prompt-item {
  background: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 16px;
  margin-bottom: 16px;
}
body.theme-dark .prompt-item {
  background: rgba(15, 23, 42, 0.5);
}
.prompt-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}
.prompt-header-row h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}
.btn-copy-prompt {
  background: var(--accent-indigo);
  color: white;
  border: none;
  padding: 5px 14px;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.btn-copy-prompt:hover {
  transform: scale(1.04);
}
.prompt-code {
  font-family: 'Courier New', Courier, monospace;
  font-size: 0.82rem;
  color: var(--text-secondary);
  white-space: pre-wrap;
  word-break: break-word;
  background: #ffffff;
  border: 1px solid var(--border-color);
  padding: 12px;
  border-radius: 6px;
}
body.theme-dark .prompt-code {
  background: rgba(0, 0, 0, 0.25);
}

/* Footer */
.app-footer {
  border-top: 1px solid var(--border-color);
  padding: 24px;
  background: #ffffff;
  font-size: 0.88rem;
  color: var(--text-muted);
}
body.theme-dark .app-footer {
  background: rgba(10, 15, 29, 0.85);
}
.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}
.developer-name {
  color: var(--accent-indigo);
  font-weight: 700;
}
.footer-github-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.88rem;
  transition: color var(--transition-fast);
  margin-right: 14px;
}
.footer-github-link:hover {
  color: var(--accent-indigo);
}
.status-indicator {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--accent-emerald);
}
.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-emerald);
}

/* Helper Utilities */
.hidden { display: none !important; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 640px) {
  .header-container { padding: 12px 16px; }
  .result-details { grid-template-columns: 1fr; }
  .hidden-mobile { display: none; }
  .mode-tab { padding: 8px 14px; font-size: 0.85rem; }
}